Calibrating means for piston meters



Aug. 10, 1943; A. GRISE 2,325,537

CALIBRATING MEANS FOR PISTON METERS I Filed NOV. 14, 1942 INVENTOR Azmm Z. 61%:

Patented Aug. 10,1943 I METERS Alfred L. Gris, Springfield, Mass assignerfto Gilbert, & Barker Manufacturing Company, West Springfield, 1 Ma Massachusetts Application more; 14, iMatseii iNc, 465,599: 7 Qsoiai si (ant -247) This invention relates .to improvements incalibrating' means for piston meters; enabling variation of the strokev of the pistonto be efiected in order to adjust the meter for the discharge' of a predetermined operation. t r V V 7 There are in'the prior art many-means for the 'same'purpose; In -meters using a crank'and con hecting rod drive between the pistons anwsha'ft,

the crank has been 'madeof' variable throwS In meters, wherein the pistons-act through cam followers on a cam-fixed to the meterShaft, the

cam ha beeri'made of variable'thr'ow as shown for example in UJS'. Patent No. 2,121',120,*granted June 21, 1938, on-aninvention of Warren-'13; 1'

De -Lancey. The necessity: for adjusting the and relatively inexpensive, construction, TIeS'OIt has been ,made to an adjusting 's'crew'which is mounted-in the ,cylinder head for adjustment in thedirection of the axis of the piston and which is adapted to be engagedbythe"pistonlto determine one end of the stroke thereof. One example of this construction is found in 'U. Si Patent N0.

,2.G91,912,;granted AugustBl, 1937, on an inven tion of.-Warren De Lancey. The construction has the disadvantage that it isnoisyin operation due to the impingement'of, theepiston', while trav= ,eling at'substantial' speed, with the fixed stoptr ".{I'hisinventionhas for an object the provision of an I adjusting screw, operable from outside the cylinder, whereby the cam follower, carriedby' t the piston, can be moved toward'or away from the cam onthe meter shaft to vary the stroke of the piston.

This arrangement measured quantity per cycle of,

is simple, inexpensive and ss.,. acorporation of of the calibrating means- In this drawing;the-calibrating;ineansihas been shown by way of illustrative example in connectionwith a piston mete'r of the typefshown inDe Lancey Patent No. 2,091,912 One of the plurality of cylinders isshown' ati15' and two others are shown in part at Band 1; "These cylinders radiate from a central chambe 8 and "throw'of such cranks Lor'cams' from outside the meter, leads to complicated 'and expensive struc,-' t mes which it is desired to avoid. For a siniple rtrolsjthe adniissionflof liquid to and thedischarg'e of liquid'ffom the cylindersla's by wayfoiconduits' such as 22; .1 Thi 'shaft 'alscgdrives whatever. reg-1' 1 'isterin'g ineans is usedfto indicate the I amount they are arrangedin opposed pairs] One of the i l pistons is shown at 9. L'Ifh'e two laterally-spaced w v members, shown in part-at I 0', are 'used to rig-idly interconnect the' 'pisto'n'fi to" the "piston inzthe opposed cylinderf' not "shown; The two halves ll andnl of piston lifbetween' which the piston leather'ES'iS cIamped fare he'ldtogetherfland to v members I ii by cap screws l4. The two laterallyspacerl'v members "l fiinterconne'ct the two pistons n incylinders' fi and TLQ-Carried by'"each pistonis a caznffollo'wefiadapted*toi engage; and drive? av :rcam l'fiffixedona shaft ll whichis mounted: n"

V bearings l8intheupperand 'ber BL Oneof these followe to drive the va ve of t e meter whichi on of liquid passedthrough he'meizerr I operable in a commercially satisfactory manner.

While the construction involves l ost motion -betweenthe cam and one. of the-"cam followers,

the amount of lost motionis small and the en I v gagement between the follower and cam occurs atthe start of the stroke before thepiston has acquiredmuch speedwith gtheresult thatsuch engagement is notnoisy. r The invention will be disclosed tothe accompanying drawing-in which; 7

l and -2 are fragmentary sectional plan and sectional elevational views respectively, of

a piston meter; having a calibrating means .em-

bodying'the invention; V v r Fig. 3 is, an exterior encl'view illustrative of the means for sealing the calibrating means; and

with reference This'inventionprovidesaispecial mountingof a cam" follower, such as I afja'nd means whereby 0 its position -relative"'to1cam' 3lfi may be adjusted with conveniencei'andfacc cylinder and-' with other later be described.

The follower roll eirio .piston part and forms, tqggtner 'with the an jacent' leg ofbiacketit, aaiiut which can moved back' and forth within limits in; thefdireci "tioii of the axis'i'of 'the pis'to n and radiallyof cam a '86-: The first-named legofai'igle'bracliet 24 'l i'es. between and slidably engages ifiriisheid s'urfaees v 26 on the' conn'ec'ting members!!! which prevent i the bracket and itsinut' fronfrotating v adjustingia-screw is fniarked I21. -It 'is Fig; .4 is a detail view or the adjusting: new .f

erfwalls'of chain- V is' shownasaroll {lsron 'iston 9. iThea-other followen -ifixed 3in} position relative to members lilfis marked'ill acy' from outside the vantages whi'ch -wil1 The other leg ofthis bracket-has anfi utwaidly "projecting'cyhnd'rical h-ub 25'pwhich i'si threaded to receive the i adjusting s r w snow-n "iniFigI4." The-hub 2,5 is slidably engagedfinj-faj' u cylindrical; bore formedin andT coaxiallyfof the I What I claim is:

1. In a meter of the type wherein fluid under pressure is admitted to and discharged from a cylinder to reciprocate a piston carrying a cam follower which engages and drives a cam on the meter shaft, stroke-adjusting means comprising a support for said follower mounted on the piston for movement toward and away from the cam, adjustable connecting means between said support and piston includinginterengaged nut and screw elements, one such element being rotatably mounted in the piston and held against movement in the direction of its axis and the other such element being fixed to said support and mounted for'movement in the direction of its own axis and held against rotationabout such axis, and means operable from outside said cylinder for turning the rotatable element.

2. In a meter of the type wherein fluidunder pressure is admitted to and dischargedfrom a cylinder to reciprocate a piston carrying a cam follower which engages and drives a cam on the meter shaft, stroke-adjusting means'comprising a screw having a shank mounted in the piston for rotation about its axis and normally held against sliding movement in the direction of such axis, a nut threaded on the screw and having a part which carries said follower, said. nut mount ed on the piston for sliding movement in the direction of the axis of the screw and held against rotation, and means operable from outside said,

cylinder for turning said screw. 7 a

3. In a meter of the type wherein fluid under pressure is admitted to and discharged from a cylinder to reciprocate a piston carrying a cam follower which' engages and drives a cam on the meter shaft, stroke-adjusting means comprising a support for said follower mounted on the piston for movement toward and away from the cam,

adjustable connecting means between said. support and piston including interengaged nut and screw elements, one such element being rotatably mounted in the piston and held against 'movement in the direction of its axis and the other such element being fixed to said support and mounted for movement in the direction of its own axis and held against rotation about such axis, and a rotatable member mounted 'in the head of the cylinder and operable from outside the cylinder, said rotatable element and'said rotatable member mounted with their axes 'in the. cylinder in any position that assume in its stroke.

ed on the'piston' for sliding movement in the direction of the axis of the screw'and held against I rotation, a member rotatably mounted in the cylinder head and operable from outside the cylinder, said member and said shank 'havingtele scoping parts providing for relative axial slida ing movement throughout the stroke of the piston and for a'relative non-rotatable connection, whereby the screw maybe turned from, outside the piston may 5. In a meter of the type wherein fluid under pressure is admitted to and discharged from'a cylinder to reciprocatea piston carrying a cam follower which engages and drives a cam on the meter shaft, stroke-adjusting means comprising a screw having a shank extending through the piston and mounted therein, for rotation about 7 its axis and normally heldagainst sliding movement in tn'e direction of such axis, a fiangeoni said shank adapted-to abut one face ofthe pis-f ton, a spring on the shank acting against the opposite faceiof the piston to hold said flange against the first-named face, a nut threaded on the screwaand having a part which carries said follower, said nut mounted on the piston for sliding movement in the direction ofthe axis of the screw and held against rotation, a member rotatably mounted in the cylinder head and 0perable from outside the cylinder, said member and said shank having telescoping partsprov'id ing for relative axial sliding movement throughalignment and being slidably but non-rotatably interengaged, whereby the rotatable member can turn the rotatable element in any position of the piston. 7

4. In a meter ofthe type wherein fiuid under pressure is admitted to and discharged from a cylinder to reciprocate a piston carrying a cam follower which engages and drives a cam onthe meter shaft, stroke-adjusting means comprising,

a screw having a shank mounted in the piston for rotation about its axis and normally held against sliding movement in the direction of such axis, a nut threaded on the screw and having a 'part which carries said follower, said nut mountout the stroke of theq'piston and for a relative,

non-rotatable connectiomwhereby the screw may be turned from outside the cylinder in any p0 v sition that the piston may assume in its stroke. 6. In a meter of the type. wherein fluid under pressure is admitted to and discharged from a cylinder to reciprocate a piston carrying a cam follower which engages and drives a cam on the meter shaft, stroke-adjustingmeans comprising a screw having av shank mounted in the piston for rotation about its axis and normally held against sliding movementin'the direction of such axis, a nut threaded on the screw and having a part which carries said follower, said nut mountadapted tobe compressedbysaid shoulder, a

spring-acting to move said member and'portionto compress said packing, said member and said shank having telescoping parts providing, for

relative axial sliding movement throughout thestroke ofthe piston and for arelative non-m5 tatable connection, whereby the screw may be turned from outsidethe cylinder in any position that the piston may assume in its stroke.

"ALFRED L. GRISII 

